/** 下拉框 dropdown **/
.overlay{
    position: fixed;
    top: 0; height: 0;
    left: 0; width: 0;
    background: url('../images/overlay.gif') repeat;
}
.overlay.overlay-modal{ bottom: 0; height: auto; right: 0; width: auto; }
.dropdown-box{ position: absolute; }
.dropdown{
    background: #fff;
    border: 1px solid #c5d9e8;
}